US9362009B2 - Cross-section reducing isotope system - Google Patents

Cross-section reducing isotope system Download PDF

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Publication number
US9362009B2
US9362009B2 US11/946,258 US94625807A US9362009B2 US 9362009 B2 US9362009 B2 US 9362009B2 US 94625807 A US94625807 A US 94625807A US 9362009 B2 US9362009 B2 US 9362009B2
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United States
Prior art keywords
target
rod
irradiation
isotope production
reservoirs
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US11/946,258
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US20090135983A1 (en
Inventor
II William Earl Russell
Christopher J. Monetta
Russell Patrick Higgins
Vernon W. Mills
David Grey Smith
Carlton Wayne Clark
Michael S. DeFilippis
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Nordion Canada Inc
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GE Hitachi Nuclear Energy Americas LLC
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Priority to US11/946,258 priority Critical patent/US9362009B2/en
Assigned to GE-HITACHI NUCLEAR ENERGY AMERICAS LLC reassignment GE-HITACHI NUCLEAR ENERGY AMERICAS LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SMITH, DAVID GREY, DEFILIPPIS, MICHAEL S., MILLS, VERNON W., MONETTA, CHRISTOPHER J., CLARK, CARLTON WAYNE, HIGGINS, RUSSELL PATRICK, RUSSELL, WILLIAM EARL, II
Priority to CA2643841A priority patent/CA2643841C/en
Priority to TW097144364A priority patent/TW200931447A/zh
Priority to JP2008294019A priority patent/JP5547887B2/ja
Priority to ES08169773.2T priority patent/ES2606924T3/es
Priority to EP08169773.2A priority patent/EP2065899B1/en
Priority to RU2008146953/07A priority patent/RU2503073C2/ru
Priority to CN2008101796338A priority patent/CN101471151B/zh
Publication of US20090135983A1 publication Critical patent/US20090135983A1/en
Publication of US9362009B2 publication Critical patent/US9362009B2/en
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Assigned to NORDION (CANADA) INC. reassignment NORDION (CANADA) INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GE-HITACHI NUCLEAR ENERGY AMERICAS LLC
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/326—Bundles of parallel pin-, rod-, or tube-shaped fuel elements comprising fuel elements of different composition; comprising, in addition to the fuel elements, other pin-, rod-, or tube-shaped elements, e.g. control rods, grid support rods, fertile rods, poison rods or dummy rods
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21G—CONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES
    • G21G1/00—Arrangements for converting chemical elements by electromagnetic radiation, corpuscular radiation or particle bombardment, e.g. producing radioactive isotopes
    • G21G1/02—Arrangements for converting chemical elements by electromagnetic radiation, corpuscular radiation or particle bombardment, e.g. producing radioactive isotopes in nuclear reactors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors
    • Y02E30/38—

Definitions

  • the present disclosure relates generally to isotope production in light water power reactors.
  • radioactive isotopes are used for medical, industrial, research, and commercial applications.
  • radioisotopes may be produced by irradiating target isotope materials with nuclear particles.
  • the target atoms either transmute directly into the desired isotope, or a radioisotope is produced through a chain of absorption and decay that subsequently generates the desired radioactive product.
  • nuclear reactors which produce a flux of neutrons
  • particle accelerators or cyclotrons which produce a flux of charged particles, usually protons, but sometimes electrons or other particles.
  • medical and industrial radioisotopes have been produced since 1957 by Canada's National Research Universal (NRU) reactor at the Atomic Energy of Canada's (AECL's) Chalk River Laboratories in Ontario, Canada.
  • the NRU produces a high percentage of the world's medical and industrial radioisotopes, including molybdenum-99, a critical isotope used for medical diagnoses.
  • radioisotopes used for medical, industrial, research and commercial applications include thallium-201, which is used for medical cardiac imaging; calcium-44, which is used in bone growth studies; iridium-192, which is used for nondestructive testing of construction and other materials; cobalt-60, which is used to destroy cancer cells, to disinfect surgical equipment and medications, and the sterilization of food supplies; thulium-170, which is used for portable blood irradiations for leukemia, lymphoma treatment, and power source; gadolinium-153, which is used for osteoporosis detection and SPECT imaging; nickel-63, which can be used for the creation of long-life batteries; and americium-241, which is used in smoke detectors.
  • thallium-201 which is used for medical cardiac imaging
  • calcium-44 which is used in bone growth studies
  • iridium-192 which is used for nondestructive testing of construction and other materials
  • cobalt-60 which is used to destroy cancer cells, to disinfect surgical equipment and medications, and the
  • specimen rods containing an isotope target are inserted through penetrations in the NRU in a continuous process and subject to irradiation therein, so as to produce isotopes at a desired specific activity for use in nuclear medicine and/or industrial applications.
  • the isotope targets are then irradiated during operation of the power generating nuclear reactor. After irradiation, the radioisotope is recovered from the target and used for preparing various radiopharmaceuticals for nuclear medical procedures.
  • an isotope production target rod for a power generating nuclear reactor includes at least one rod central body including an outer shell that defines an internal cavity.
  • the isotope production target rod can additionally include a plurality of irradiation targets within the internal cavity.
  • the irradiation targets are positioned in a spatial arrangement utilizing a low nuclear cross-section separating medium to maintain the spatial arrangement.
  • the isotope production target rod can include at least one rod central body including an outer shell that defines an internal cavity and an irradiation target canister within the internal cavity of each respective rod central body.
  • the isotope production target rod additionally includes a plurality of irradiation targets positioned within each respective irradiation target canister in a spatial arrangement utilizing a low nuclear cross-section separating medium to maintain the spatial arrangement.
  • the isotope production target rod can include at least one rod central body including an outer shell that defines an internal cavity, an irradiation target canister within the internal cavity of each respective rod central body, and at least one irradiation target receptacle within each respective irradiation target canister.
  • each irradiation target receptacle can include a plurality of target reservoirs in a pattern within at least a portion of an outer surface of each irradiation target receptacle.
  • a fuel bundle for a nuclear power reactor can include a plurality of fuel rods and at least one isotope production target rod.
  • Each isotope production target rod can include at least one rod central body including an outer shell that defines an internal cavity, and a plurality of irradiation targets within the internal cavity. The irradiation targets are positioned in a spatial arrangement utilizing a low nuclear cross-section separating medium to maintain the spatial arrangement.
  • a method for producing isotopes in a nuclear power reactor can include sealing a plurality of irradiation targets within an irradiation target canister. More particularly, the irradiation targets are positioned within the canister in a spatial arrangement utilizing a low nuclear cross-section material to maintain the irradiation targets in the spatial arrangement.
  • the method can additionally include sealing the irradiation target canister within an internal cavity of an isotope production target rod, and including the isotope production target rod within a nuclear power reactor fuel bundle.
  • FIG. 1 is a perspective sectional view of a portion of a nuclear reactor core illustrating a plurality of fuel bundle assemblies including fuel rods, isotope production target rods, tie plates, spacer grids and channels, in accordance with various embodiments of the present disclosure.
  • FIG. 2 is a partially exploded sectional view of an exemplary fuel bundle assembly included in the portion of a nuclear reactor core shown in FIG. 1 , in accordance with various embodiments of the present disclosure.
  • FIG. 3 illustrates various isotope production target rods that can be included within the fuel bundle assembly shown in FIG. 2 , in accordance with various embodiments of the present disclosure.
  • FIG. 4 is an exemplary illustration of an isotope production target rod segment included in a multi-segment isotope production target rod of the fuel bundle assembly shown in FIG. 2 , in accordance with various embodiments of the present disclosure.
  • FIG. 5 is an exemplary illustration of a central body included in each of the isotope production target rods shown in FIG. 4 , in accordance with various embodiments of the present disclosure.
  • FIG. 6 is an exemplary longitudinal cross-sectional view of the central body shown in FIG. 5 , illustrating a plurality of irradiation targets positioned within a cavity of the central body in a predetermined spatial arrangement by a low nuclear cross-section medium, in accordance with various embodiments of the present disclosure.
  • FIG. 7 is an exemplary longitudinal cross-sectional view of the central body shown in FIG. 5 , illustrating a plurality of irradiation targets positioned within a cavity of the central body in a predetermined spatial arrangement by a low nuclear cross-section medium, in accordance with various other embodiments of the present disclosure.
  • FIG. 8 is an exemplary illustration of an irradiation target receptacle shown in FIG. 7 , in accordance with various embodiments of the present disclosure.
  • FIG. 9 is an exemplary illustration of an irradiation target receptacle shown in FIG. 7 , in accordance with various other embodiments of the present disclosure.
  • FIG. 10 illustrates the fabrication of the irradiation target receptacles shown in FIGS. 8 and 9 , in accordance with various embodiments of the present disclosure.
  • FIG. 11 illustrates the fabrication of the irradiation target receptacles shown in FIGS. 8 and 9 , in accordance with various other embodiments of the present disclosure.
  • FIG. 12 illustrates the fabrication of the irradiation target receptacles shown in FIGS. 8 and 9 , in accordance with yet other embodiments of the present disclosure.
  • FIG. 13 is an exemplary illustration of a section of an irradiation target receptacles shown in FIGS. 8 through 12 having an internal threaded bore in at least one end, in accordance with various embodiments of the present disclosure.
  • FIG. 13A is an exemplary illustration of the irradiation target receptacles shown in FIGS. 8 through 12 including irradiation target receptacles formed to have a depth sufficient to retain two or more irradiation target pellets, in accordance with various embodiments of the present disclosure.
  • FIG. 13B is an exemplary illustration of the irradiation target receptacles shown in FIGS. 8 and 9 including irradiation target receptacles formed as diametrical bores extending through the respective target receptacle suitable for retaining a plurality of irradiation target pellets, in accordance with various embodiments of the present disclosure.
  • FIG. 14A is an exemplary illustration of an irradiation target receptacle shown in FIG. 7 , in accordance with various embodiments of the present disclosure.
  • FIG. 14B is an exemplary longitudinal cross-sectional view of the central body, shown in FIG. 5 , including a plurality of the irradiation target receptacles shown in FIG. 14A , in accordance with various other embodiments of the present disclosure.
  • FIG. 15A is an exemplary longitudinal cross-sectional view of the central body shown in FIG. 5 , having a double containment construction, in accordance with various embodiments of the present disclosure.
  • FIG. 15B is an exemplary redial cross-sectional view of the central body shown in FIG. 15A , in accordance with various embodiments of the present disclosure.
  • FIG. 1 a perspective sectional view of an exemplary portion of a power generating nuclear reactor core 10 , e.g., a portion of a boiling water nuclear reactor core, is provided.
  • the exemplary portion of the power generating nuclear reactor core 10 includes four fuel bundle assemblies 14 A, 14 B, 14 C and 14 D through which, and around which, a liquid moderator, i.e., a coolant, flows when the fuel bundles 14 A, 14 B, 14 C and 14 D are installed and the reactor is functioning.
  • a liquid moderator i.e., a coolant
  • Each fuel bundle 14 A, 14 B, 14 C and 14 D generate heat used to convert the coolant to steam that is used to generate electrical power.
  • Each fuel bundle 14 A, 14 B, 14 C and 14 D is substantially the same in structure, form and function. Thus, for simplicity and clarity, only fuel bundle 14 A will described herein.
  • the fuel bundle 14 A generally includes an outer channel 22 surrounding an upper tie plate 26 and a lower tie plate 30 .
  • a plurality of fuel rods 18 are arranged in an array within the fuel bundle 14 A and pass through a plurality of spacer grids 34 longitudinally, or axially, spaced one from the other along the length of the fuel bundle 14 A.
  • the fuel rods 18 and typically one or more water rods 38 , are maintained in spaced relation, i.e., an array, to each other within the fuel bundle 14 A by the spacer grids 34 so as to define passages for the reactor coolant flow between fuel rods 18 .
  • the fuel bundle can include any number of spacer grids 34 spaced along the entire axial length of the fuel bundle 14 A as needed for maintaining the fuel rods 18 in the desired array, e.g., three to eight spacer grids 34 .
  • the fuel bundle 14 A can include one or more isotope production target rods 20 .
  • the fuel rods 18 contain nuclear fuel, e.g., uranium, that produces a neutron flux
  • the isotope production target rods 20 contain irradiation targets that are irradiated by the neutron flux to produce a desired radioisotope.
  • the irradiation targets can be fabricated of any desired isotope such as cadmium, cobalt, iridium, nickel, thallium, etc.
  • the fuel and isotope production target rods 18 and 20 can have substantially the same construction with the exception of fuel rods 18 containing nuclear fuel and the isotope production target rods 20 containing the irradiation targets. However, only the construction, function, components, elements, assemblies, features, attributes, etc., of the isotope production target rods 20 will be further described below.
  • the isotope production target rods 20 can be full length rods, part length rods, multi-segment rods or any combination thereof.
  • the fuel bundle 14 A can include one or more full length isotope production target rods 20 A, one or more part length isotope production target rods 20 B, one or more multi-segment isotope production target rods 20 C, or any combination thereof.
  • Each isotope production target rod 20 e.g., isotope production target rods 20 A, 20 B and 20 C, generally includes at least one central body 40 coupled at an upper end to an upper end cap 42 and/or coupled at a lower end to a lower end cap 46 .
  • the upper and lower end caps 42 and 46 mate with the respective upper and lower tie plates 26 and 30 to stabilize the ends of each isotope production target rod 20 , e.g., rods 20 A, 20 B and/or 20 C, within the channel 22 .
  • each full length isotope production target rod 20 A includes a central body 40 having an axial length extending approximately the length of fuel bundle 14 A and coupled at the upper and lower ends to the upper and lower end caps 42 and 46 .
  • Each part length isotope production target rod 20 B includes a central body 40 having an axial length that is less than the approximate length of the fuel bundle 14 A.
  • the central body 40 of each part length isotope production target rod 20 B can be 3 ⁇ 4, 1 ⁇ 2, 1 ⁇ 4, etc., the approximate length of the fuel bundle 14 A.
  • the central body 40 of each part length isotope production target rod 20 B is coupled at a lower end to a lower end piece 46 .
  • the lower end pieces 46 mate with the respective tie plate 30 to stabilize the end of each isotope production target rods 20 within the channel 22 .
  • each multi-segment isotope production target rod 20 C includes a plurality of rod segments 50 that are interconnected such that the multi-segment isotope production target rod 20 C can have an axial length substantially equal to the length of fuel bundle 14 A or any incremental shorter length, e.g., a part length isotope production target rod 20 B.
  • Each isotope production target rod segment 50 includes a central body 40 such that the aggregated isotope production target rod 20 C comprises a plurality of central bodies 40 .
  • each rod segment 50 includes a male connector 58 connected to a first end and a female receptacle 62 having an internal bore 64 connected to an opposing second end. The male connector 58 and female receptacle 62 are mateable to interconnect the respective rod segments 50 .
  • the distal ends 54 of the upper-most and lower-most rod segments 50 are respectively coupled to the upper and lower end caps 42 and 46 .
  • each multi-segment isotope production target rod 20 C includes a plurality of interconnected rod segments 50 .
  • the various rod segments 50 can have different axial, or longitudinal, lengths and different outside diameters, and remain within the scope of the present disclosure.
  • each multi-segment isotope production target rod 20 C can be assembled to have a desired length and one or more outside diameters along the length of the aggregated isotope production target rod 20 C by interconnecting various length and diameter rod segments 50 . Therefore, it should be understood that FIG. 4 illustrates an exemplary isotope production target rod segment 50 and the accompanying description herein relates to each rod segment 50 of each multi-segment isotope production target rod 20 C, regardless of the length and/or diameter of each respective rod segment 50 .
  • FIG. 5 an exemplary illustration of the one or more central bodies 40 included in each of the isotope production target rods 20 shown in FIG. 3 is provided, in accordance with various embodiments of the present disclosure. More particularly, the central body 40 shown in FIG. 5 and the accompanying description relates to each central body 40 of each full length isotope production target rod 20 A, each part-length isotope production target rod 20 B and each rod segment 50 of each multi-segment isotope production target rod 20 C.
  • Each central body 40 of each isotope production target rod 20 includes an outer shell 65 that defines an internal cavity 66 for retaining a plurality of irradiation targets 70 .
  • the cavity 66 is accessible prior to the upper and lower end caps 42 and 46 (shown in FIG. 3 ) and/or the male connector 58 and/or the female receptacle 62 (shown in FIG. 4 ) being connected to the opposing ends of the respective central body 40 .
  • the irradiations targets 70 are positioned and retained within the cavity 66 in a particular spatial arrangement utilizing a low nuclear cross-section separating medium 74 .
  • a spatial arrangement of the irradiation targets can be designed to optimize absorption by the irradiation targets 70 of neutrons generated by the fuel bundles 14 within the power generating nuclear reactor core 10 .
  • the separating medium 74 is constructed of, fabricated from or comprises a low nuclear cross-section material, substance, gas, etc., that is substantially invisible to neutrons, i.e., has a very low or substantially negligible absorption rate of neutrons.
  • the separating medium can be fabricated of zirconium, aluminum or any other suitable material, substance, gas, etc., that has a low nuclear cross-section.
  • the particular spatial arrangement of the irradiation targets 70 and the low nuclear cross-section of the separating medium 74 minimize the impact of the isotope production target rods 20 on energy generation of the power generating nuclear reactor core 10 while maximizing the specific activity, i.e., neutron absorption, of the irradiation targets 70 .
  • FIG. 6 provides a cross-sectional view of an exemplary central body 40 illustrating a plurality of irradiation target disks 78 and target spacers 82 positioned within the cavity 66 , of the respective central body 40 , in accordance with various embodiments of the present disclosure.
  • the irradiation targets 70 can comprise disks or wafers 78 fabricated of the desired isotope, e.g., cobalt, and the separating medium 74 can comprise a plurality of irradiation target spacers 82 positioned between each adjacent irradiation target disk 78 .
  • Each spacer 82 has a thickness T selected to position the irradiation target disks 78 in the spatial arrangement predetermined to provide the optimal absorption of neutrons by the irradiation target disks 78 .
  • the spacers 82 can have the same thickness T such that each irradiation target disk 78 is equally spaced from all adjacent irradiation target disks 78 , i.e., equally spaced from the irradiation disk 78 directly above and below each respective irradiation target disk 78 .
  • the separating medium 74 i.e., the spacers 82
  • the spacers 82 provide a low nuclear cross-section separating medium and spacing of the irradiation target disks 78 designed to minimize the energy impact of the isotope production target rods 20 on the power generating nuclear reactor core 10 while maximizing the neutron absorption of the irradiation target disks 78 .
  • the irradiation target disks 78 and spacers 82 are sized such that an interstitial space 86 can exist between an inner wall of the cavity 66 and irradiation target disks 78 and spacers 82 .
  • the interstitial space 86 allows for thermal expansion of the irradiation target disks 78 and the spacers 82 .
  • the interstitial space 86 and any space existing between the target disks 78 and spacers 86 can be backfilled with a substantially zero nuclear cross-section, high thermal conductivity gas, such as helium.
  • the substantially zero nuclear cross-section, high thermal conductivity gas presents substantially no impedance to the neutron flux of the power generating nuclear reactor core 10 while providing high thermal conductivity to remove heat from the irradiation target disks 78 and spacers 82 of the respective central body 40 .
  • FIG. 6 illustrates essentially the entire cavity 66 being filled with irradiation target disks 78 and spacers 82 , it should be understood that less than the entire cavity 66 can be filled with irradiation target disks 78 and spacers 82 and remain within the scope of the present disclosure.
  • FIG. 7 provides a cross-sectional view of an exemplary central body 40 illustrating a plurality of irradiation target pellets 90 retained with a plurality of reservoirs 94 within a target receptacle 98 positioned within the cavity 66 , in accordance with various embodiments of the present disclosure.
  • the irradiation targets 70 can comprise the target pellets 90 fabricated of the desired isotope, e.g., cobalt
  • the separating medium 74 can comprise the target receptacle 98 having the reservoirs 94 strategically positioned along at least a portion of an outer surface of the target receptacle 98 .
  • the reservoirs 94 are strategically located along the outer surface of the target receptacle 98 to position the irradiation target pellets 90 in the spatial arrangement predetermined to provide the optimal absorption of neutrons by the irradiation target pellets 90 .
  • the target reservoirs 94 are equally spaced around the target receptacle 98 outer surface between opposing axial end portions 102 such that each target reservoir 94 is a substantially equal distance, e.g., 1 mm, 2 mm or 3 mm, from each adjacent target reservoir 94 .
  • the separating medium 74 i.e., the target receptacle 98
  • the target receptacle 98 can be fabricated from low nuclear cross-section material such as zirconium or aluminum. Therefore, the low nuclear cross-section target receptacle 98 and spacing of the target receptacles 94 are designed to minimize the energy impact of the isotope production target rods 20 on the power generating nuclear reactor core 10 while maximizing the neutron absorption of the irradiation target pellets 90 .
  • the target receptacle 98 is sized such that an interstitial space 106 can exist between an inner wall of the cavity 66 and target receptacle 98 .
  • the interstitial space 106 allows for thermal expansion of the irradiation target pellets 90 and the target receptacle 98 .
  • the interstitial space 106 and any space between the target pellets 90 and the reservoirs 94 can be backfilled with a substantially zero nuclear cross-section, high thermal conductivity gas, such as helium.
  • the substantially zero nuclear cross-section, high thermal conductivity gas presents substantially no impedance to the neutron flux of the power generating nuclear core 10 while providing high thermal conductivity to remove heat from the irradiation target pellets 90 and target receptacle 98 .
  • the irradiation target pellets 90 are shown to be generally cylindrical in shape, it is envisioned that the irradiation target pellets 90 could have any shape suitable to fit within the target reservoirs 94 .
  • the target pellets 90 can be spherical, oblong, pyramidal, cubic, rectangular, etc.
  • the target reservoirs 94 of each target receptacle 98 are sized to retain a single irradiation target pellet 90 . More particularly, in various implementations, the target reservoirs 94 can be sized to retain the respective irradiation target pellet 90 in a particular orientation ( FIG. 8 ), while in other implementations, the target reservoirs 94 can be sized to retain the respective irradiation target pellet 90 in a random orientation ( FIG. 9 ).
  • each irradiation target pellet 90 can be cylindrical, oblong, rectangular, etc., or any shape having an axial length L that is greater than an outside diameter d of each respective target pellet 90 .
  • each irradiation target pellet 90 is slightly smaller than an inside diameter D of target reservoirs 94 , which is smaller than the length L of the irradiation target pellets 90 . Therefore, each irradiation target pellet 90 will only fit within each respective target reservoir 94 having an axial center line of each irradiation target pellet 90 coaxially aligned with an axial center line of the respective target reservoir 94 .
  • each target reservoir 94 has in inside diameter D that is slight greater than the longer of an axial length L and an outside diameter d of the irradiation target pellets 90 , which can have generally any shape. Accordingly, only a single irradiation target pellet 90 can be retained within each target reservoir 94 , but the irradiation target pellets 90 can be retained within the respective target reservoirs 94 in any random orientation.
  • the irradiation target pellets 90 can be cylindrical in shape wherein the axial length L of each irradiation target pellet 90 is approximately 1.25 times the diameter d of each irradiation pellet 90 , and the diameter D of the target reservoirs 94 is approximately 1.5 times the diameter d of each irradiation pellet 90 .
  • the cylindrical irradiation target pellets 90 can be retained within the respective target reservoirs 94 in any orientation, and each target reservoir 94 is only large enough to retain a single irradiation pellet 90 .
  • Each target receptacle 98 can be fabricated in any suitable manner that will provide each target reservoirs 94 with substantially the same dimensions, i.e., the same depth X (shown in FIG. 9 ) and diameter D.
  • each irradiation target receptacle 98 can be fabricated to have a solid body.
  • the target reservoirs 94 can be milled, drilled or bored in solid body 110 in the predetermined pattern along at least a portion of an outer surface of the solid body 110 to have substantially the same depth X and diameter D (shown in FIGS. 8 and 9 ).
  • FIG. 10 in various embodiments, each irradiation target receptacle 98 can be fabricated to have a solid body.
  • the target reservoirs 94 can be milled, drilled or bored in solid body 110 in the predetermined pattern along at least a portion of an outer surface of the solid body 110 to have substantially the same depth X and diameter D (shown in FIGS. 8 and 9 ).
  • each irradiation target receptacle 98 can be fabricated to have a tubular body 114 with a longitudinal center cavity 116 therethrough.
  • the target reservoirs 94 can be milled, drilled or bored in tubular body 114 in the predetermined pattern along the at least a portion of an outer surface of the tubular body 114 to have substantially the same depth X and diameter D (shown in FIGS. 8 and 9 ).
  • the longitudinal center cavity 116 reduces the amount of mass, i.e., material, of the target receptacle 98 , thereby reducing the nuclear cross-section.
  • the longitudinal center cavity 116 can be backfilled with a substantially zero nuclear cross-section, high thermal conductivity gas, such as helium, along with the interstitial space 106 , thereby providing increased thermal conductivity to remove heat from the irradiation target pellets 90 and target receptacle 98 , as described above.
  • a substantially zero nuclear cross-section, high thermal conductivity gas such as helium
  • each irradiation target receptacle 98 can be fabricated to include a perforated tubular sleeve 118 and a solid core 120 fitted within the tubular sleeve 118 .
  • the tubular sleeve 118 is fabricated to have a substantially constant thickness Y and to include a plurality of holes 122 therein in the predetermined pattern, wherein each hole 122 has substantially the same diameter D (shown in FIG. 9 ).
  • the target reservoirs 94 will be formed to have substantially the same depth X, equal to the tubular sleeve thickness Y, and diameter D (shown in FIG. 9 ).
  • each irradiation target receptacle 98 includes an axial threaded bore 126 .
  • the threaded bore provides a means to connect the respective irradiation target receptacle 98 to a target pellet loading and/or unloading device (not shown) during loading and/or unloading of the irradiation target pellets 90 into and/or out of the target reservoirs 94 .
  • a target pellet loading and/or unloading device not shown
  • the irradiation target receptacle is fabricated to have the tubular body 114 and longitudinal center cavity 116 , at least a portion of at least one end of the longitudinal center cavity 116 can include threads for connecting the respective irradiation target receptacle 98 to a pellet loading and/or unloading device.
  • one or more of the irradiation target receptacles 98 can be fabricated such that the target reservoirs 94 have a depth X suitable to retain two or more irradiation target pellets 90 . More particularly, each target reservoir 94 has a depth X such that the each respective target reservoir 94 retain two or more irradiation target pellets 90 but will not intersect or penetrate any adjacent radially, or circumferentially, aligned target reservoirs 94 . Similar to the embodiments described above with regard to FIGS.
  • each target reservoirs 94 can be sized to retain the respective two or more irradiation target pellets 90 in a particular orientation, e.g., coaxially aligned with a center axis of each respective target reservoir 94 ( FIG. 8 ), or the target reservoirs 94 can be sized to retain the respective two or more irradiation target pellets 90 in a random orientation ( FIG. 9 ).
  • the target receptacle 98 can be fabricated in the same manner as described above with regard to FIGS. 11 and 12 such that the depth X of each target reservoir 94 is deep enough to retain two or more irradiation target pellets 90 .
  • the target receptacle 98 can be fabricated to include a threaded center bore 126 , as described and illustrated in FIG. 11 , and also to include the target reservoirs 94 having a depth X of sufficient to retain two or more irradiation target pellets 90 .
  • one or more of the irradiation target receptacles 98 can be fabricated such that the target reservoirs 94 are formed as bores extending through a diameter P of the irradiation target receptacles 98 . Accordingly, each radially, or circumferentially, aligned target reservoir 94 bore will intersect at an axial center of the respective irradiation target receptacles 98 .
  • Each target reservoir 94 bore is, thus, suitable to retain a plurality, e.g., two or more, irradiation target pellets 90 . Similar to the embodiments described above with regard to FIGS.
  • each target reservoirs 94 can be sized to retain the respective plurality of irradiation target pellets 90 in a particular orientation, e.g., coaxially aligned with a center axis of each respective target reservoir 94 bore ( FIG. 8 ), or the target reservoirs 94 can be sized to retain the respective two or more irradiation target pellets 90 in a random orientation ( FIG. 9 ).
  • FIG. 14A illustrates an irradiation target receptacle 98 , in accordance with various embodiments
  • FIG. 14B provides a cross-sectional view of an exemplary central body 40 including a plurality of the irradiation target receptacles 98 , shown in FIG. 14A , in accordance with various embodiments of the present disclosure.
  • the irradiation target receptacle 98 can have an axial length Z that is incrementally shorter than the axial length M of the internal cavity 66 such that a plurality of target receptacles 98 can be positioned within the cavity 66 .
  • each target receptacle 98 can include the irradiation target reservoirs 90 strategically positioned along the outer surface of the respective target receptacle 98 , as shown and described with reference to FIGS. 7, 8 and 9 .
  • the target reservoirs 94 can be strategically positioned about at least one of opposing axial ends 130 of the respective target receptacle 98 , as shown in FIG. 14A .
  • the target reservoirs 94 formed within at least one of the opposing axial ends 130 can be sized to retain the respective irradiation target pellets 90 in a particular orientation, e.g., coaxially aligned with a center axis of each respective target reservoir 94 .
  • the target reservoirs 94 formed within at least one of the opposing axial ends 130 can be sized to retain the respective irradiation target pellets 90 in a random orientation.
  • the target receptacles 98 can include the target reservoirs 94 strategically positioned about at least one of the opposing axial ends 130 and along the outer surface of the respective target receptacle 98 .
  • each irradiation target receptacle 98 can be any suitable length sufficient to include irradiation target reservoirs 94 sized to retain one or more irradiation targets 90 (not shown).
  • the target receptacles 98 can have an axial length Z of approximately 1/16 of an inch, 2/16 of an inch, or greater.
  • low nuclear cross-section spacers 150 can be disposed between adjacent target receptacles 98 .
  • Each spacer 150 has a thickness Q selected to position the target receptacles 98 in a desired spatial arrangement predetermined to provide the optimal absorption of neutrons by the irradiation target pellets 90 (not shown).
  • the plurality of target receptacles 98 within the exemplary central body 40 shown in FIG. 14B can comprise one or more target receptacles 98 ( FIG. 14A ) having the target reservoirs 94 strategically positioned about at least one of the opposing axial ends 130 , one or more target receptacles 98 having the target reservoirs 94 strategically positioned along the outer surface of the respective target receptacle 98 , one or more target receptacles 98 having the target reservoirs 94 strategically positioned about at least one of the opposing axial ends 130 and along the outer surface of the respective target receptacle 98 , or any combination thereof.
  • one or more of the central bodies 40 of one or more of the isotope production target rods 20 can have a double containment construction to provide an additional level of protection against radiation leakage from faulty welds are breaching of the integrity of the central bodies 40 due to fretting or wear on the central bodies 40 during reactor operation. More particularly, in various embodiments, one or more of the central bodies 40 within one or more of the isotope production target rods 20 can include an irradiation target canister 134 concentrically positioned within the internal cavity 66 .
  • the irradiation target canister 134 includes an outer shell 138 that defines an internal cavity 142 for retaining the irradiation targets 70 , e.g., the disks 78 and/or the pellets 90 , and the separating medium 74 , e.g., the spacers 82 and/or the target receptacle(s) 98 , in the same manner as described above with regard to FIGS. 5 through 14 .
  • the irradiation targets 70 can be positioned and retained within the internal cavity 142 of the irradiation target canister 134 in the particular spatial arrangement utilizing the low nuclear cross-section separating medium 74 in the same manner and utilizing the same structures, substances, and materials as described above in the various embodiments regarding the internal cavity 66 of the central body 40 illustrated in FIGS. 5 through 14 .
  • an interstitial space 146 can exist between an inner wall of the cavity 66 and the irradiation target canister 134 .
  • the interstitial space 146 allows for thermal expansion of the irradiation target canister 134 .
  • the interstitial space 146 can be backfilled with a substantially zero nuclear cross-section, high thermal conductivity gas, such as helium to provide high thermal conductivity to remove heat from the irradiation target canister 134 while presenting no impedance to the neutron flux of the power generating nuclear reactor core 10 .
  • the irradiation target canister outer shell 138 can be fabricated from a low nuclear cross-section material such as zirconium, aluminum or any other suitable material or, substance that has a low nuclear cross-section.
  • irradiation target disks 78 , separating medium spacers 82 , irradiation target pellets 90 , target receptacles 98 and the irradiation target canister 134 have been generally described and illustrated herein as having cylindrical shapes, i.e., round or circular cross-sectional geometries, it should be understood that each of the irradiation target disks 78 , separating medium spacers 82 , irradiation target pellets 90 , target receptacles 98 and the irradiation target canister 134 can have cross-sectional geometries other than cylindrical of circular and remain within the scope of the disclosure.
  • each of the irradiation target disks 78 , separating medium spacers 82 , irradiation target pellets 90 , target receptacles 98 and the irradiation target canister 134 can have square, triangular, rectangular, hexagonal, octagonal, trapezoidal cross-sectional geometries, or any other suitable cross-sectional geometry and remain within the scope of the disclosure.
  • the cross-sectional geometries for some or all of the irradiation target disks 78 , separating medium spacers 82 , irradiation target pellets 90 , target receptacles 98 and the irradiation target canister 134 can be different than that of some or all of the respective irradiation target disks 78 , separating medium spacers 82 , irradiation target pellets 90 , target receptacles 98 and the irradiation target canister 134 .
  • an isotope production target rod 20 can be constructed having irradiation targets with a hexagonal cross-section retained within the reservoirs 94 of an irradiation target receptacle 98 having a triangular cross-section that is housed within an irradiation target canister 134 with a square cross-section, or any other possible combination of cross-sectional geometries.
  • spatially relative terms such as “beneath”, “below”, “lower”, “above”, “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

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US11/946,258 US9362009B2 (en) 2007-11-28 2007-11-28 Cross-section reducing isotope system
CA2643841A CA2643841C (en) 2007-11-28 2008-11-13 Cross-section reducing isotope system
TW097144364A TW200931447A (en) 2007-11-28 2008-11-17 Cross-section reducing isotope system
JP2008294019A JP5547887B2 (ja) 2007-11-28 2008-11-18 同位体生成ターゲット棒
ES08169773.2T ES2606924T3 (es) 2007-11-28 2008-11-24 Sistema con sección eficaz reducida para la producción de isótopos
EP08169773.2A EP2065899B1 (en) 2007-11-28 2008-11-24 System with reduced nuclear cross-section for isotope production
RU2008146953/07A RU2503073C2 (ru) 2007-11-28 2008-11-27 Уменьшающая поперечное сечение изотопная система
CN2008101796338A CN101471151B (zh) 2007-11-28 2008-11-28 截面降低的同位素系统

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RU2008146953A (ru) 2010-06-10
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